如何在CSS中删除此边框？

Question

有一个包含这些框的灰色轮廓，有人能帮我删除/不显示这些灰色线条吗？

进入检查模式内的Chrome，我不清楚，在哪里是参数编辑，以删除该轮廓。

我正在使用Shopify编辑器，但我想有更好的软件来做这些变化。另外，原始代码来自这个站点，DEV是: Steve Meredith

https://codepen.io/steveeeie/pen/NVWMEM

谢谢，LC

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CSS：

max-width: 100%;
vertical-align: middle;
padding-bottom:10px;
padding-left: 3px;
}  

:root{
  --background-dark: #FFFFFF;
  --text-light: rgba(255,255,255,0.6);
  --text-lighter: rgba(255,255,255,0.9);
  --spacing-s: 8px;
  --spacing-m: 16px;
  --spacing-l: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 64px;
  --width-container: 1200px;
}

*{
  border: 0;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html{
  height: 100%;
  font-family: 'Montserrat', sans-serif;
  font-size: 14px;
}

body{
  height: 100%;
}

.hero-section{
  align-items: flex-start;
  background-image: #FFFFFF;
  display: flex;
  min-height: 100%;
  justify-content: center;
  padding: var(--spacing-xxl) var(--spacing-l);
}

.card-grid{
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  grid-column-gap: var(--spacing-l);
  grid-row-gap: var(--spacing-l);
  max-width: var(--width-container);
  width: 100%;
}

@media(min-width: 540px){
  .card-grid{
    grid-template-columns: repeat(2, 1fr); 
  }
}

@media(min-width: 960px){
  .card-grid{
    grid-template-columns: repeat(4, 1fr); 
  }
}

.card{
  list-style: none;
  position: relative;
}

.card:before{
  content: '';
  display: block;
  padding-bottom: 150%;
  width: 100%;
}

.card__background{
  background-size: cover;
  background-position: center;
  border-radius: var(--spacing-l);
  bottom: 0;
  filter: brightness(0.75) saturate(1.2) contrast(0.85);
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transform-origin: center;
  trsnsform: scale(1) translateZ(0);
  transition: 
    filter 200ms linear,
    transform 200ms linear;
}

.card:hover .card__background{
  transform: scale(1.05) translateZ(0);
}

.card-grid:hover > .card:not(:hover) .card__background{
  filter: brightness(0.5) saturate(0) contrast(1.2) blur(20px);
}

.card__content{
  left: 0;
  padding: var(--spacing-l);
  position: absolute;
  top: 0;
}

.card__category{
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-s);
  text-transform: uppercase;
}

.card__heading{
  color: var(--text-lighter);
  font-size: 1.9rem;
  text-shadow: 2px 2px 20px rgba(0,0,0,0.2);
  line-height: 1.4;
  word-spacing: 100vw;
}

HTML：

section class="hero-section">
<div class="card-grid"><a class="card" href="#">
<div class="card__background" style="background-image: url('https://cdn.shopify.com/s/files/1/0855/3802/files/59f7d87736e4c.jpg?v=1602082250');"></div>
<div class="card__content">
<p class="card__category">Download PDF</p>
<h3 class="card__heading">FiberClick Instruction Manual</h3>
</div>
</a> <a class="card" href="https://cdn.shopify.com/s/files/1/0855/3802/files/BTCSBBWWOCL-1P.pdf?v=1602082225">
<div class="card__background" style="background-image: url('https://images.pexels.com/photos/1109541/pexels-photo-1109541.jpeg?auto=compress&amp;cs=tinysrgb&amp;dpr=2&amp;h=750&amp;w=1260');"></div>
<div class="card__content">
<p class="card__category">Download PDF</p>
<h3 class="card__heading">FiberClick Datasheet PDF</h3>
</div>
</a> <a class="card" href="https://beyondtech.us/collections/fiber-cleaners">
<div class="card__background" style="background-image: url('https://images.pexels.com/photos/442154/pexels-photo-442154.jpeg?auto=compress&amp;cs=tinysrgb&amp;dpr=2&amp;h=750&amp;w=1260');"></div>
<div class="card__content">
<p class="card__category">Beyondtech.global</p>
<h3 class="card__heading">Purchase from Beyondtech</h3>
</div>
</a><a class="card" href="https://www.amazon.com/Fiber-Optic-Cleaner-Compatible-Connectors/dp/B086Q17M98/ref=sr_1_8?dchild=1&amp;keywords=fiber+cleaner+beyondtech&amp;qid=1602082414&amp;sr=8-8">
<div class="card__background" style="background-image: url('https://images.pexels.com/photos/4560039/pexels-photo-4560039.jpeg?auto=compress&amp;cs=tinysrgb&amp;dpr=2&amp;h=750&amp;w=1260');"></div>
<div class="card__content">
<p class="card__category">Amazon.com</p>
<h3 class="card__heading">Amazon Product Page</h3>
</div>
</a>
<div></div>
</div>
</section>

Answer 1

您需要将其outline属性设置为none。

.card {
  outline: none;
}

但是如果你这样做了，不要给样式

.card:focus{
  // maybe the same style as :hover state
}

为了实现更好的用户体验。

编辑

在我看到你的钢笔后，我做了两处改动。

.card{
  list-style: none;
  position: relative;
  outline: none; // this is new
}

// I add :focus selector here
.card:hover .card__background,
.card:focus .card__background {
  transform: scale(1.05) translateZ(0);
}